https://yuni.com/latin/Quod-erat-demonstrandum-QED/Which-was-to-be-demonstrated/1465/
Quod erat demonstrandum (QED)
Latin Phrase: Quod erat demonstrandum (QED) - Which was to be demonstrated
quod erat demonstrandumqed
https://www.qed-verein.de/node/3
Seminare | Quod Erat Demonstrandum e.V.
quod erat demonstrandumseminarev